drivers/gpio/gpiolib.h

   1 /*
   2  * Internal GPIO functions.
   3  *
   4  * Copyright (C) 2013, Intel Corporation
   5  * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #ifndef GPIOLIB_H
  13 #define GPIOLIB_H
  14
  15 #include <linux/err.h>
  16 #include <linux/device.h>
  17
  18 enum of_gpio_flags;
  19
  20 /**
  21  * struct acpi_gpio_info - ACPI GPIO specific information
  22  * @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo
  23  * @active_low: in case of @gpioint, the pin is active low
  24  */
  25 struct acpi_gpio_info {
  26         bool gpioint;
  27         bool active_low;
  28 };
  29
  30 #ifdef CONFIG_ACPI
  31 void acpi_gpiochip_add(struct gpio_chip *chip);
  32 void acpi_gpiochip_remove(struct gpio_chip *chip);
  33
  34 struct gpio_desc *acpi_get_gpiod_by_index(struct device *dev, int index,
  35                                           struct acpi_gpio_info *info);
  36 #else
  37 static inline void acpi_gpiochip_add(struct gpio_chip *chip) { }
  38 static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { }
  39
  40 static inline struct gpio_desc *
  41 acpi_get_gpiod_by_index(struct device *dev, int index,
  42                         struct acpi_gpio_info *info)
  43 {
  44         return ERR_PTR(-ENOSYS);
  45 }
  46 #endif
  47
  48 int gpiochip_request_own_desc(struct gpio_desc *desc, const char *label);
  49 void gpiochip_free_own_desc(struct gpio_desc *desc);
  50
  51 struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
  52                    const char *list_name, int index, enum of_gpio_flags *flags);
  53
  54 #endif /* GPIOLIB_H */